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Keying a green screen clip

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Joker in the Pack
Keying a green screen clip
on Nov 6, 2005 at 10:00:32 pm

When ever I key a green clip the edges around the object i've cut out are alwayse blocky looking and are never clean. Ive tried shooting the person from father away, I've tried moving the person farther away and i've tried lighting the person from the back but none of these help. How do I fix this?


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Walter Biscardi
Re: Keying a green screen clip
on Nov 7, 2005 at 12:27:09 am

Are you shooting DV? If so, blockiness is a fact of life as it's a 5:1 compressed format. Better keys come from shooting uncompressed.

Walter Biscardi, Jr.
http://www.biscardicreative.com

Now editing "Good Eats" in HD for the Food Network

"I reject your reality and substitute my own!" - Adam Savage, Mythbusters


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Joker in the Pack
Re: Keying a green screen clip
on Nov 7, 2005 at 12:31:47 am

How do I uncompress it?


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Walter Biscardi
Re: Keying a green screen clip
on Nov 7, 2005 at 1:02:28 am

[Joker in the Pack] "How do I uncompress it?"


You don't "uncompress" DV. You go out and get a high quality camera like a BetaSP, DigiBeta, HDCAM, etc... and shoot your green screen in an uncompressed format. Then you capture it in an uncompressed format. Then you work on the green screen in that uncompressed format. You'll get a very clean key using a tool like the Boris Continuum filters.

Walter Biscardi, Jr.
http://www.biscardicreative.com

Now editing "Good Eats" in HD for the Food Network

"I reject your reality and substitute my own!" - Adam Savage, Mythbusters


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Noah Kadner
Re: Keying a green screen clip
on Nov 7, 2005 at 9:26:43 am

Also- with all respect to Motion it's about the last tool in the toolbox I use for greenscreen keying. FCP, After FX, Commotion, Shake, Combustion- those are much better suited for greenscreen keying.

Noah


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Mark Spencer
Re: Keying a green screen clip
on Nov 9, 2005 at 1:44:58 am

With DVGarage's new DVMatte Blast, Motion becomes a great realtime keyer: http://dvgarage.com/prod/prod.php?prod=dvmatteb
Mark

--
Mark Spencer
Freelance Editor/Producer
Apple-certified instructor, Final Cut Pro and Motion
Author, Motion Visual Quickstart Guide from Peachpit Press (coming soon)
http://www.applemotion.net


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Graeme Nattress
Re: Keying a green screen clip
on Nov 10, 2005 at 1:19:17 am

Only thing is Walter, is that none of those formats are uncompressed, and HDCAM is even more compressed than DV :-)

For DV, best thing to do is to bump it to uncompressed in FCP, using either my G Nicer or G Chroma Sharpen (From Film Effects) which really fix up the chroma great. Do this in an uncompressed timeline, then export that as a new clip.

That is, until I get such chroma fixing working as a plugin in Motion - that's my next task.

Graeme

- http://www.nattress.com - Film Effects and Standards Conversion for FCP


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Brian FitzGerald
Re: Keying a green screen clip
on Nov 7, 2005 at 7:49:46 pm

I have read all the responses to this so far and they are correct in what they say about compression but do not provide you a solution.
You can key DV with Motion.
An earlier thread of this type in this forum regarding this same question provided the solution.
Go to dvGarage and buy/try their new dvMatteBlast.
I bought it and it works very well.

Brian FitzGerald
FitzVideo.com


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